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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. class Ideone
  6. {
  7. 	public static void main (String[] args)
  8. 	{
  9. 		double a, S;
  10. 		Scanner in = new Scanner(System.in);
  11. 		a = in.nextInt();
  12. 		S = (Math.sqrt(3)/4)*Math.pow(a, 2);
  13. 		System.out.println(S);
  14. 	}
  15. }
  16.  
Success #stdin #stdout 0.07s 4386816KB
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3.8971143170299736
https://ideone.com/nCukJR
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
secret

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